The invention discloses a waveform correlation coefficient and current sudden change-based hybrid-voltage same-tower fault phase selection method. An autocorrelation coefficient and a virtual autocorrelation coefficient are introduced according to the characteristic that a phase angle and amplitude of a fault phase after a fault are probably changed; and when a phase current difference sudden quantity phase selection component is distinguished to be a single-phase fault, further auxiliary judgment is performed according to the characteristic shown by the correlation coefficients and by consideration of zero-sequence mutual inductance influence under a strong magnetic field relation. Firstly, if the autocorrelation coefficient of a phase except a judgment fault is smaller than 0.9, supplement judgment is made as a fault phase, phase selection is completed, otherwise the virtual autocorrelation coefficient of a suspected fault phase is further judged; if the autocorrelation coefficient is smaller than 0.9, supplement judgment is made as the fault phase, phase selection is completed, otherwise a final phase selection result is same as a phase current sudden quantity phase selection result. By the waveform correlation coefficient and current sudden change-based hybrid-voltage same-tower fault phase selection method, the problem of phase selection by mistake of the phase current sudden quantity phase selection component when a non-grounding fault occurs in a hybrid-voltage same-tower four-line bridge voltage can be prevented.